getInstalledRelatedApps: Avoid blocking the UI thread doing computation.

content/public/android/junit/src/org/chromium/content/browser/installedapp/InstalledAppProviderTest.java

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser.installedapp;
 
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.res.AssetManager;
 import android.content.res.Resources;
 import android.os.Bundle;
 
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 import org.robolectric.res.builder.DefaultPackageManager;
 
 import org.chromium.base.test.util.Feature;
 import org.chromium.installedapp.mojom.InstalledAppProvider;
 import org.chromium.installedapp.mojom.RelatedApplication;
+import org.chromium.testing.local.CustomShadowAsyncTask;
 import org.chromium.testing.local.LocalRobolectricTestRunner;
 
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.HashMap;
 
 /**
  * Ensure that the InstalledAppProvider returns the correct apps.
  */
 @RunWith(LocalRobolectricTestRunner.class)
-@Config(manifest = Config.NONE)
+@Config(manifest = Config.NONE, shadows = {CustomShadowAsyncTask.class})
 public class InstalledAppProviderTest {
     private static final String ASSET_STATEMENTS_KEY =
             InstalledAppProviderImpl.ASSET_STATEMENTS_KEY;
     private static final String RELATION_HANDLE_ALL_URLS =
             "delegate_permission/common.handle_all_urls";
     private static final String NAMESPACE_WEB =
             InstalledAppProviderImpl.ASSET_STATEMENT_NAMESPACE_WEB;
     private static final String PLATFORM_ANDROID =
             InstalledAppProviderImpl.RELATED_APP_PLATFORM_ANDROID;
     private static final String PLATFORM_OTHER = "itunes";
@@ skipping 736 matching lines @@
                 createRelatedApplication(PLATFORM_ANDROID, PACKAGE_NAME_3, null)};
 
         setAssetStatement(PACKAGE_NAME_2, NAMESPACE_WEB, RELATION_HANDLE_ALL_URLS, ORIGIN);
         setAssetStatement(PACKAGE_NAME_3, NAMESPACE_WEB, RELATION_HANDLE_ALL_URLS, ORIGIN);
 
         RelatedApplication[] expectedInstalledRelatedApps =
                 new RelatedApplication[] {manifestRelatedApps[1], manifestRelatedApps[3]};
         verifyInstalledApps(manifestRelatedApps, expectedInstalledRelatedApps);
     }
 }